Merge pull request #295 from YusukeIwaki/porting/9352

feat: add element validation

lib/puppeteer/element_handle.rb

@@ -126,6 +126,13 @@ def wait_for_xpath(xpath, visible: nil, hidden: nil, timeout: nil)
 
   define_async_method :async_wait_for_xpath
 
+  def to_element(tag_name)
+    unless evaluate('(node, tagName) => node.nodeName === tagName.toUpperCase()', tag_name)
+      raise ArgumentError.new("Element is not a(n) `#{tag_name}` element")
+    end
+    self
+  end
+
   def as_element
     self
   end

spec/integration/element_handle_spec.rb

@@ -508,4 +508,13 @@
       end
     end
   end
+
+  describe 'to_element' do
+    it 'should work' do
+      page.content = '<div class="foo">Foo1</div>'
+      element = page.query_selector('.foo')
+      div = element.to_element('div')
+      expect(div).to be_a(Puppeteer::ElementHandle)
+    end
+  end
 end